Control system



Feb. 7, 1939. H. BANY 2,146,556

CONTROL SYSTEM Filed July 3, 1936 Inventor:

Herman Bang,-

by z a'dwl is Attorney.

Patented Feb. 7, 1939 UNITED STATES PATENT OFFICE CONTROL SYSTEM YorkApplication July 3, 1936, Serial No. 88,790

16 Claims.

Referring to the accompanying drawing, which diagrammatically shows anembodiment 01 my invention in connection with a system for con- Itrolling the sequential connection and disconnectionyofa plurality ofcapacitors to and from I an electric circuit,.l represents analternating current loadri'circuit connected to a suitable source ofalternating cu'rrent12. 9, 4 and 5 represent a pluralityoi capacitorswhich are arranged to be connected to the alternating current circuit Iby means oi the circuit breakers 8, I and 9 respectively. These circuitbreakers may be of any suitable type, examples of which are well itknown in the art. As shown in the drawing,

the circuit breakers 9, 'I and 8 are of the wellknown latched-in typeand are respectively provided with closing coils 9, I9 and II, latchesI2, I9 and I4 for holding the respective circuit break- ?0 ers in theirclosing positions, and trip coils I5, It and I! for respectivelyreleasing the latches I2, I3 and I4.

For controlling the connections between the capacitors I, 4 and I andthe load circuit I in :5 response to a predetermined electricalcondition of the circuit I, which in the particular arrangement shown inthe drawing is the voltage of the circuit I, I provide a contact makingvoltmeter I 9 which is connected to the circuit I so as to o beresponsive to the voltage thereof. The voltmeter II is arranged toeflect the completion 01' a circuit for a time relay I9 when the voltageof the circuit I is below a predetermined value and the completion oi acircuit for a time relay 20 ll when the voltage of the circuit I isabove a predetermined value. are arranged in any suitable manner so thatthey do not close their respective contacts until after their respectivecoils have been energized for a to predetermined length of time.

In'order that the capacitors 3, 4 and I may be successively connected tothe circuit I in the order named when the voltage across the circuit Iremains below a predetermined value, the reas lay I9 is arranged tocomplete an energizing cir- The time relays I9 and 29 cuit for ahesitating control relay 2| associated with the circuit breaker 6, iithis circuit breaker is open. If the circuit breaker 6 is closed and thehesitating control relay 2I is de-energized, the closing of the contactsof the relay I9 is ar- 5 ranged to eiiect the energlzation of ahesitating control relay 22 associated with the circuit breaker I, ifthis circuit breaker is open. If both of the circuit breakers 6 and Iare closed and the associated control relays 2I and 22 are 10 in theirrespective de-energized positions, the closing of the contacts of therelay I9 completes an energizing circuit for a hesitating control relay29 associated with the circuit breaker 8, if this circuit breaker isopen. Each hesitatlng control relay, when energized, is arranged toeiIect the closing of an energizingcircuit for the closing coil oi theassociated circuit breaker to elect the, closing, thereoi. I

For effecting the disconnection of the capacitors 3, 4 and 5 in thereverse order from that in which they are connected to the circuit I,the relay 29, when energized, is arranged to eiiect, first, the openingof the circuit breaker 9, if all of the circuit breakers are closed;then the opening of the circuit breaker I, if the circuit breaker'8 isopen; and finally the opening of the circuit breaker 6, if the circuitbreakers I and 9 are open. When the circuit breaker 9 is closed and thecontacts of relay 20 close, a circuit is 90 completed for a hesitatingcontrol relay 2iassociated with the circuit breaker 8. The relay 24,when energized, eflects the completion oi an energizing circuit for thetrip coil I! to effect the opening or the circuit breaker 8. When thecircuit breaker I is closed, the circuit breaker 8 is open and itsassociated control relay 24 is in its de-energized position, the closingoi the contacts of relay 20 completes an energizing circuit for ahesitating control relay 2! associated with the circuit breaker I. Thecontrol relay 2!, when energized, eflects the completion of anenergizing circuit for the trip coil It to eiiect the opening of thecircuit breaker 'I. When the circuit breaker 9 is closed, the circuitbreakers I and 9 5 are open and their associated control relays 24 and25 are both in their deenergized positions, the closing of-the contactsof relay 20 completes an energizing circuit for the trip coil I5 toeflect the opening of the circuit breaker 6. so

Each of the hesitating control relays, when in its energizing position,is arranged to complete an energizing circuit for a control relay 26which, when energized, interrupts the energizing circuits of both of therelays I9 and 29. Conseg quently,- when any hesltating control relay isenergized to effect the operation of its associated circuit breaker, thenext circuit breaker in the predetermined sequence cannot be operateduntil a sufficient length of time has elapsed for the energizedhesitating control relay to return to its de-energized position, theassociated circuit breaker to reach its new position, and the time relayl9 or 20 has been energized for a sumoient length of time to close itscontacts after the last energized control relay has returned to itsdeenergized position. In this manner, I amable to provide a simplearrangement for insuring that the circuit breakers B, I and 8 areoperated in the desired sequence.

The operation of the arrangement shown in the drawing is as follows:When all 01' the circuit breakers are open and the voltage of thecircuit I decreases below a predetermined value, so that the relay I8closes its contacts 21, a circuit is completed through the contacts 28of relay 28 for the time relay I9. If the voltage of the circuit Iremains below this predetermined value for a predetermined length oftime, the relay I 9 closes its contacts 29 to complete through thecontacts 38 of the open circuit breaker 6 an energizing circuit for thehesitating control relay 2 I. By closing its contacts 3!, the relay 2icompletes an energizing circuit for the closing coil 9 of the circuitbreaker 6 so that this circuit breaker closes and connects the capacitor3 to the circuit I. By closing its contacts 32, relay 2i completes anenergizing circuit for the relay 26, which, by opening its contacts 28,effects the de-energization of the time relay l9.

If the connection of the capacitor 2 does not restore the voltage of thecircuit 9 to normal so that the voltmeter it opens its contacts 2?, thecircuit for the time relay i9 is again completed after the circuitbreaker 8 has been closed a predetermined time. By opening its contacts3d, the circuit breaker 6 efiects the de-energization of the hesitatingcontrol relay 2 l, which, after being de-=energized for a predeterminedtime, returns to its normal position, thereby opening its contacts andeffecting the de-energization of the relay By closing its contacts 28,the above-traced circuit for the time relay is is completed. After beingenergized for a predetermined time, the relay i9 closes its contacts 29and now completes through the contacts 33 of the hesitating controlrelay 2i and the auxiliary contacts 36 of the closed circuit breaker 6and the auxiliary contacts 35 of the open circuit breaker i anenergizing circuit for the hesitating control relay 22. By closing itscontacts 38, the control relay 22 completes an energizing circuit forthe closing coil W of the circuit breaker l to efiect the connection ofthe capacitor 4 to the load circuit I. By closing its contacts 31, thecontrol relay 22 efiects the energization of the control relay 26, whichin turn, by opening its contacts 28, effects the de-energiza tion of thetime relay it. By opening its contacts 35, the circuit breaker l efiectsthe de-energization of the hesitatlng control relay 22, which, afterbeing de-energized for a predetermined time, returns to itstie-energized position.

If the capacitors i and 2 do not take sumcient leading current torestore the voltage of the circuit l to normal, the time relay I9 isagain energized through the contacts 2'! of the contact making voltmeterI8 after the relay 22 has been restored to its normal position and haseffected the energization of the relay 28. The closing of the contacts29 of the relay It now completes an encrgizing circuit for thehesitating control relay 28, through the contacts 83 of the hesitatingcontrol relay 2|, the auxiliary contacts 84 on closed circuit breaker 8,and contacts 88 of the hesitating control relay 22, auxiliary contacts89 on the closed circuit breaker I, and the contacts 40 of the opencircuit breaker 8. By closing its contacts 4|, the control relay 23completes an energizing circuit for the closing coil II of the circuitbreaker 8 to efiect the connection of the capacitor 5 to the circuit I.The closing of the circuit breaker 8 efiects the de-energization of thecontrol relay 23, and the control relay 26 in the same manner as theclosing of the other circuit breakers did.

When all of the circuit breakers are closed and the voltage across thecircuit I increases above a predetermined value so that the contactmaking voltmeter I8 closes its contacts 50, a circuit is completedthrough the contacts 28 of the relay 28 for the time relay 20. If thevoltage remains above this predetermined value for a predetermined time,the relay 20 closes its contacts 5| and completes through the auxiliarycontacts 52 on the circuit breaker 8 an energizing circuit for thecontrol relay 241. By closing its contacts 53, the control relay 2tcompletes an energizing circuit for the trip coil I l to effect theopening of the circuit breaker 8 so that the capacitor 5 is disconnectedfrom the load circuit I. By closing its contacts 56, the control relay2t completes an energizing circuit for the control relay 28, which inturn, by opening its contacts 28, effects the deenergization of the timerelay 2@. When the circuit breaker 8 opens, the circuit of the controlrelay t i is opened at the auxiliary contacts 52 of the circuit breakerso that this control relay returns to its de-energized position apredetermined time after the circuit breaker t opens.

If the circuit voltage is still too high after the capacitor 5 has beendisconnected and the hesitating control relay 24% has returned to itsdeenergized position and thereby effected the reenergization of the timerelay 28, the closing of the contacts 5i of the time relay 29 efiects,through the contacts 55 of the control relay 2 3, the auxiliary contacts56 on the circuit breaker 8, and the auxiliary contacts 57 on thecircuit breaker 7, an energizing circuit for the control relay 25. Byclosing its contacts 58, the control relay 25 completes an energizingcircuit for the trip coil it of the circuit breaker i to effect theopening thereof so that the condenser 1 is disconnected from the loadcircuit I. By closing its contacts 82, the relay 25 completes anenergizing circuit for the control relay 26, which in turn effects thedeenergization of the time relay 20 in the manner heretofore described.The opening of the auxiliary contacts 5'! of the circuit breaker 7effects the de-energization of the control relay 25 so that, after thecircuit breaker has been opened for a predetermined time, the controlrelay 25 returns to its de-energized position, thereby efiecting thede-energization of the control relay 2S and the re-energization of thetime relay 20, if the load circuit voltage is still too high.

The closing of the contacts 5i of the relay 20 after the control relay25 returns to its normal position completes an energizing circuitthrough the contacts 55 of the control relay 24, the auxiliary contacts56 of the circuit breaker 8, the auxiliary contacts 82 of the circuitbreaker 1, the contacts 63 of the control relay 25, and the auxiliarycontacts 64 of the circuit breaker 6 for the trip coil I5, to effect theopening of the circuit 8,140,556 breaker 6 so as to disconnect capacitorI the load circuit l.

While I have, in accordance with the patent statutes, shown anddescribed my invention as applied to a particular system and asembodying various devices diagrammatically indicated, changes andmodifications will be obvious to those skilled in the art, and Itherefore aim in the appended claims to cover all such changes andmodifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. In combination, a plurality of devices, and means for effecting theoperation 01' said devices in a predetermined sequence including acontrol relay individual to each device, means responsive to theenergization of one of said control relays for effecting the movement ofthe associated device from one predetermined position to a secondpredetermined position, and means for eil'ecting the energization of thecontrol relay associated with a device only after each of the controlrelays associated with the preceding devices in said prede erminedsequence has been deenergized subsequent to being energized to eflectthe movement of its associated device to said second position.

2. In combination, a plurality of devices, and means for effecting theoperation of said devices in a predetermined sequence including acontrol relay individual to each device, means responsive to theenergization of one of said control relays for effecting the movement ofthe associated device from one predetermined position to a secondpredetermined position, and means con-' trolled by said control relaysfor effecting the energization of a control relay only when all of thecontrol relays associated with devices preceding in said predeterminedsequence the device associated with the control relay being energizedare in their de-energized positions and each of said preceding devicesis in said second position.

3. In combination, a plurality of devices, and means for effecting theoperation of said devices in a predetermined sequence including acontrol relay individual to each device, means responsive to theenergization of one of said control relays for effecting the movement ofthe associated device irom one predetermined position to a secondpredetermined position, and means for effecting the energization of thecontrol relay associated with a device only after each of the controlrelays associated with the preceding devices in said predeterminedsequence has been deenergized subsequent to being energized to eflectthe movement of its associated device to said second position, and acommon control device for controlling the energization of all of saidcontrol relays.

4. In combination, a plurality of devices, and

means for eflecting the operation of said devices in a predeterminedsequence including a control relay individual to each device, meansresponsive to the energization of one of said control relays foreiIecting the movement of the associated device from one predeterminedposition to a second predetermined position, means controlled by saidcontrol relays for effecting the energization of a control relay onlywhen all of the control relays associated with devices preceding in saidpredetermined sequence the device associated with the control relaybeing energized are in their de-energized positions and each of saidpreceding devices is in said second position, and a common controldevice for controlling the energization oi all of said control relays.

5. In combination, a plurality of devices, and means for effecting theoperation of said devices in a predetermined sequence including acontrol relay individual to each device,means responsive to theenergization of one of said control relays for effecting the movement ofthe as; )ciated "e-' vice from one predetermined position to a secondpredetermined position, means for eflecting the energization of saidcontrol relays including means dependent upon each of the control relaysassociated with all of the devices preceding in said sequence the deviceassociated with the relay to be energized being in its de-energizedposition, and means responsive to the energization of a control relayfor preventing the energization 01 another control relay for apredetermined time.

6. In combination, a plurality of devices, and means for eflecting theoperation of said devices in a predetermined sequence including acontrol relay individual to each device, means responsive to theenergization of one of said control relays for eflecting the movement ofthe associated device from one predetermined position to a secondpredetermined position, means controlled by said control relays foreffecting the energization oi a con rol relay only when all of thecontrol relays associated with devices preceding in said predeterminedsequence the device associated with the control relay being energizedare in their de-energized positions and each of said preceding devicesis in said second position, and means responsive to the energization ofa control relay for preventing the energization of another control relayfor a predetermined time.

7. In combination, a plurality of switches, and means for effecting theclosing of said switches in a predetermined sequence including ahesitating control relay individual to each switch, means responsive tothe energization of one of said control relays for eiIecting the closingof the associated switch, and means controlled by said relays andswitches for effecting the energization of a control relay only when allof the switches preceding in said predetermined sequence the switchindividual to the control relay being energized are closed and all ofthe control relays associated with the closed switches are in theirde-energized positions.

8. In combination, a plurality of switches, and means for effecting theclosing of said switches in a predetermined sequence including ahesitating control relay individual to each switch, means responsive tothe energization of one of said control relays for eil'ecting theclosing of the associated switch, and means for energizing said relaysincluding means controlled by said relays and switches for eiIecting theenergization of a control relay only when all of the switches precedingin said predetermined sequence the switch individual to the controlrelay being energized are closed.

9. In combination, a plurality of switches, and means for effecting theclosing of said switches in a predetermined sequence including ahesitating control relay individual to each switch, means responsive tothe energization of one of said control relays for effecting the closingof the associated switch, means for energizing said relays includingmeans controlled by said relays and switches for eil'ecting theenergization of a control relay only when all of the switches precedingin said predetermined sequence the switch individual to the controlrelay being energized are closed, and means responsive to theenergization of a control relay for preventing the energization ofanother control relay for a predetermined time. 10. In combination, aplurality of switches, and means for effecting the opening 01' saidswitches in a predetermined sequence including a hesitat- .sequence theswitch individual to the control relay being energized are open and allof the control relays associated with the open switches are in theirde-en'ergized position.

11. In combination, a plurality of switches, and

means for eilecting the opening of said switches in a predeterminedsequence including a hesitating control relay individual to each ofcertain of said switches, means responsive to the energization of one ofsaid control relays for effecting the opening of the associated switch,and means for energizing said relays including means controlled by saidrelays and switches for eflecting the energization of a control relayonly when all of the switches preceding in said predetermined sequencethe switch individual to the control relay being energized are open.

12. In combination, a plurality of switches, and means for efiecting theopening of said switches in a predetermined sequence including ahesitating control relay individual to each of certain of said switches,means responsive to the energization of one of said control relays foreffecting the opening of the associated switch, means for energizingsaid relays including means controlled by said relays and switches forefl'ecting the energization of a control relay only when all of theswitches preceding in said predetermined sequence the switch individualto the control relay being energized are open, and means responsive tothe energization of a control relay for preventing the energization ofanother control relay for a predetermined time.

13. In combination, a plurality of devices, and means for effecting theoperation of said devices in a predetermined sequence including acontrol relay individual to each device, timing means common to saiddevices, means for initiating the operation of said timing device, meanscontrolled by said control relays and said timing means for energizingsaid relays including means for efiecting the energization of a controlrelay only when all of the control relays associated with devicespreceding in said predetermined sequence the de vice associated with thecontrol relay being energized are in their de-energized position andsaid timing means has completed its timing operation,

and means responsive to the energization of a control relay for electingthe operation of the associated device and for restoring said timingmeans to its normal condition.

14. In combination, a plurality of circuit breakers, and means foreflecting a predetermined operation of said circuit breakers in apredetermined sequence including a hesitating control relay individualto each circuit breaker, a timing relay common to saidcircuit breakers,means for energizing said timing relay to initiate the operationthereof, means for energizing said relays including means controlled bysaid relays for effecting the energization of a control relay only whenall of the control relays associated with circuit breakers preceding insaid predetermined sequence the circuit breaker associated with thecontrol relay being energized are in their deenergized positions andsaid timing relay has completed its timing operation, and meansresponsive to the energization of a control relay for efiect ing saidpredetermined operation of the associated circuit breaker and forrestoring itself and said timing relay to their respective normalpositions.

15. A control arrangement for effecting the operation of two devices ina predetermined order including a control relay associated with one ofsaid devices, means for energizing said control relay, means responsiveto the energization of said control relay for effecting the movement ofthe associated device from one predetermined position to a secondpredetermined position, means responsive to the movement of saidassociated device to said second predetermined position for effectingthe deenergization of said control relay, and means dependent upon thesimultaneous deenergization of said control relay and its associateddevice being in said second predetermined position for efiecting themovement of the other of said devicesto a predetermined position.

16. A control arrangement for efie'cting the operation of two devices ina predetermined order including a control relay associated with one ofsaid devices, means for energizing said control relay, means responsiveto the energization of said control relay for effecting the movement ofthe associated device to a predetermined position and the subsequentdeenergization of said control device, and means dependent upon theenergization and subsequent deenergization of said control device forcontrolling the movement of the other of said devices to a predeterminedposition.

